Coral reefs form when the calcite skeletons of coral build upon each other.

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It is TRUE that coral reefs form when a structure of calcite skeletons built up by coral animals in warm, shallow ocean water. To form their skeletons, coral animals absorb the element calcium from the ocean water. The calcium is then combined with carbon and oxygen to form calcite (calcite is a mineral). When coral animals die, their skeletons remain. More corals build on top of them, gradually forming a coral reef.

This bacteria must be very strong as it has a large amount on antibiotic targeting it. this bacteria could be one of many different types and it is very hard to tell which one with out more information.